Request.RawUrl vs. Request.Url

The raw URL is defined as the part of
the URL following the domain
information. In the URL string
http://www.contoso.com/articles/recent.aspx,
the raw URL is
/articles/recent.aspx.

This means, you can use rawurl and do not have to care about through which address the server was called (for instance http://yourserver/ or http://yourserver.yourdomain.com/ if you have multiple interfaces.)

However, the URL property of an HTTPRequest object returns a System.URI object, which also contains server name.